Reviews — Some Famous Collections of Meteorites. 219 



embryonic type of lophophore and had not developed the spirally 

 coiled brachidium which we know to have occurred in many 

 Strophomenids and Productids. AVhen, however, a stage is retained 

 in the life-history it seems not impossible that descendants of an 

 animal which has passed that stage in its adult structure may 

 nevertheless stop at such a stage, and hence be more primitive in 

 their structure than their own immediate ancestors. It is therefore 

 not impossible that the Lyttoniidse have been derived from some 

 Strophomenid, as in that group we get the closest parallel to the 

 curious long narrow muscular insertions in the ventral valve. 



I wish to express my thanks to the Trustees of the Percy Sladen 

 Fund for the opportunity of visiting Texas and collecting the material 

 on which this paper is based. 



Literature referred to. 



Girty, G. H. 1908. "The Guadalupian Fauna": U.S. Geol. Surv., 



Professional Paper 58. 

 ZUGMAYER, H. 1850. " Untersuchungen iiber Bhatische Brachiopoden " : 



Beitrage zur Pal. Ost.-Ungs. m. d. Orient., Bd. i, p. 19. 

 Waagen, W. 1883. " Productus Limestone Fossils " : Pal. Ind., ser. xiii. 

 Noetling, F. 1905. "Untersuchungen iiber die Familie Lyttoniidse." : 



Waag. emend. Noetling, Palseontogr., Bd. li, pp. 129-53, pis. 

 TSCHERNYSCHEV, T. 1902. "Die Obercarbonischen Brachiopoden des Ural 



und des Timan " : Mem. du Comite geologique, St. Petersburg, vol. xvi, 



pp. 433-749, pis. 63. 



EXPLANATION OF PLATE XIV. 



Photographs of specimens of ventral valves of Poihilosakos petaloides, gen. 

 et sp. nov., from the Cisco Beds, Upper Coal-measures, Graham, Young Co., 

 Texas. 



Fig. I. A large symmetrically developed specimen to be regarded as the 

 holotype. x 2 approx. 

 II. A very small specimen. x 4 approx. 



III. Two large irregular specimens, the left of interest because the edges 



of the right posterior lateral loop have grown together to form 

 a false septum. x 2 approx. 



IV. Two individuals of medium size, x 1. 



V. The posterior part of a large shell. x 8 approx. 



E.Ei^riE'Vvrs. 



I. — A Descriptive Catalogue of the Meteorites comprised in 



the Collection" of the Geological Survey of India, Calcutta 



(on August 1, 1914). By J. Coggin Brown. Mem. Geol. Surv. 



India, vol. xliii, pt. ii, pp. 149-287, 1916. 



fTlHE collection of meteorites in the Calcutta Museum originated 



JL with the purchase, in 1865, from It. P. Greg (in this catalogue 



wrongly designated Professor) of his collection of meteorites. This 



•collection must, of course, not be confused with the large collection 



of minerals, including meteorites, which belonged to his father, 



P.. H. Greg, and was purchased by the Trustees of the British 



Museum in 1860. In 1868 the Calcutta collection was further 



